WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Open the door.
Mark the position of the striker on the door frame.
Remove the 2 bolts that retain the striker to the door frame.
Remove the striker and spacer from the door frame.
Fig 1: Removing Striker And Spacer From Door Frame